Materials Literature
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A generalized effectiveness factor equation (Eq. (32)), in terms of modified Bessel functions, is derived for a catalyst pellet of arbitrary shape. The derivation is based on utilizing an appropriate one-dimensional approximation for the Laplacian in an arbitrary shaped body subjected to a uniform external concentrati…
We present a theory of quasiperiodic tilings and more general quasiperiodic patterns with long range orientational order. We explain our "strip method" (a variant of the projection methods) on a one dimensional model. Then the icosahedral case is investigated in view of the quasicrystals of the type Al-Mn. Our method…
Resting spores of Thalassiosira scotia Fryx. et Hoban were abundant in phytoplankton net hauls collected from the Scotia Sea south of South Georgia in December 1981. Primary valves are distinguished from secondary valves by the presence of marginal striae with rounded, shoelike protrusions, villi surrounding marginal…
We suggest that the staging transformation in graphite intercalation compounds takes place through metastable, partly disordered states. A specific mechanism, involving nucleation of defect sandwiches of stage n\ifmmode\pm\else\textpm\fi{}1 in the stage-n phase, is proposed. We predict that the staging disorder is ass…
The occurrence of sepiolite and palygorskite in soils, Eocene limestones and the Asmari dolomitic limestone of Iran has been described by many workers (Bentor et al. , 1963; Martin Vivaldi & Robertson, 1971; Abtahi, 1977, 1980). No studies have been carried out on the genesis of these minerals in Iranian soils, ho…
The increasing interest in introducing cheaper forms of reinforcement for use with glass fibers within the latter quarter of this century has stimulated research in hard cellulosic fibers, their diversification, and their potential use in such areas. At present, hard cellulosic fibers are flax, jute, hemp, and ramie (…
Lead zirconate‐titanate (Pb(Zr 0.54 Ti 0.46 )O 3 ) was doped with varied concentrations of Ta 5+ and La 3+ and sintered at 1200°C for 2 h. Dense ceramic materials were obtained when the cation stoichiometry was adjusted to allow for charge compensation of the donor ions by Pb vacancies. Bulk density, capacitance at 1…
The magnetic order and magnetoelastic contribution to the structures and molecular orientations of \ensuremath{\epsilon}- and \ensuremath{\delta}-${\mathrm{O}}_{2}$ monolayers on graphite are calculated at zero temperature using a complete representation of the magnetic Hamiltonian. Antiferromagnetic order is predicte…
The transport process has been studied by the time-of-flight technique for the glasses in the systems Ge20BixSe80−x (x=0–13) and Ge20BixSe70−xTe10 (x=0–11), both of which exhibit n-type conduction in x≥9. The highly dispersive transport was observed for electrons and holes in n-type glasses, as well as in p-type glass…
Abstract A simple method to evaluate the adhesive force between solid oxidizer and polymeric fuel‐binder is presented. As an illustration, hydroxyl‐terminated polybutadiene (HTPB) sticks including several different bonding agents are bonded on ammonium perchlorate (AP) single crystals, and stress‐strain history until…
Abstract The absorption spectrum of Ti 3+ in quartz is typical for that element in an octahedral site, except for the high oscillator strength of the band which indicates intensive charge transfer, most likely between a substitutional Ti 4+ and an interstitial Ti 3+ . The biaxial anisotropy of the band is similar to t…
Abstract The complex resins derived from furfuryl‐alcohol polymerization are a result of at least four competing reactions. By converting the alcohol to its acetate ester, however, three of these reactions can be eliminated. The simpler polymer derived from furfuryl acetate has been characterized spectroscopically, an…
Abstract Marine clays of SE Norway lifted above sea-level have been subjected to weathering for 8500 years. As a result of this weathering a major part of the quartz, K-feldspar and plagioclase disappeared in the 0·2–0·6 µ m fraction. Trioctahedral illite passed through the sequence: illite → mixed-layer illite-vermic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange interaction in multinuclear transition-metal complexes. 7. Synthesis, x-ray structure, and magnetic properties of Cu3L2(CH3COO)4 (LH = N-methyl-N'-(4-methoxysalicylidene)-1,3-propanediamine), a novel linear trinuclear copper(II) compoundB. Chiari, O. Piovesana, T. T…
The ability of clay minerals to adsorb heavy metal cations is an important property in the context of the increasing contamination of the aquatic environment and soils by toxic waste. Laboratory studies of the sorption of heavy metals by clays have mostly been carried out using montmorillonite and illite (Chester, 196…
Abstract Possible alternative fuels such as ethanol and methanol can cause corrosion in mixture preparation systems, in contrast to the conventional petrol and diesel fuels. This phenomenon is due less to the pure alcohols than to the pollutions and additives. Electrochemical corrosion measurements were carried out on…
Chaetoceros muelleri Lemmermann has been reported from brackish waters in Europe and North America under more than 10 different specific names. Recently we have studied specimens of C. muelleri and C. hohnii from the western USA, as well as C. wighamoides from South Africa. We have concluded that two different forms o…
The effects of gypsum on the physical properties of two red duplex soils in northern Victoria were investigated by assessing the relative abundance of macropores (diameters greater than 75 µm) in the 0-30 mm zone of their cultivated layers. Samples were collected in October 1983 from both fallow cropped and stubble cr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structure of a new ternary chalcogenide Nb3Pd0.72Se7; interrelationships in the packing of prisms and planesDouglas A. Keszler and James A. IbersCite this: J. Am. Chem. Soc. 1985, 107, 26, 8119–8127Publication Date (Print):December 1, 1985Publication History Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical and spectroelectrochemical studies of monomeric rhodium(III) porphyrins in nonaqueous mediaK. M. Kadish, C. L. Yao, J. E. Anderson, and P. CocoliosCite this: Inorg. Chem. 1985, 24, 26, 4515–4520Publication Date (Print):December 1, 1985Publication History Publ…